Web Compatibility Support • Signin problem on Merrill Edge

Using PM 28.16.0 (32bit) on Linux, the latest available, two weeks ago mymerrill.com (a Bank of America site which redirects to olui2.fs.ml.com/login/signin.aspx) worked, now there is a long wait "transferring data from "scripts.olui2..." when the blue signin box on the left finally appears, the form entry boxes remain muted with a dark oscillating wave, but the page is "done".

The Browser Console (logging?) shows:
Content Security Policy: Ignoring ‘x-frame-options’ because of ‘frame-ancestors’ directive.
(unknown)
Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user’s experience. For more help http://xhr.spec.whatwg.org/
utag.sync.js:12:382
GET
XHR
https://dpm.demdex.net/id [HTTP/2.0 200 OK 170ms]
GET
XHR
https://target.bankofamerica.com/m2/ban ... /mbox/json [HTTP/2.0 200 OK 279ms]
ReferenceError: tradeSUP is not defined[Learn More]
signin.aspx:1388:1
SyntaxError: expected expression, got '.'[Learn More]
utag.js:5:62
POST
XHR
https://olui2.fs.ml.com/sve/cse/uiservi ... ossaryData [HTTP/1.1 200 OK 99ms]
POST
XHR
https://olui2.fs.ml.com/sve/cse/uiservi ... ossaryData [HTTP/1.1 200 OK 2303ms]
GET
XHR
https://secure.fs.ml.com/spa/widgets/se ... index.html [HTTP/1.1 200 OK 7124ms]
Error: Load timeout for modules: https://secure2.bac-assets.com/spa/widg ... c494a55.js
http://requirejs.org/docs/errors.html#timeout
require.js:1:2192

Using the latest PM 32.5.2 64bit on Win10, and turning off "Block pop-up windows", there is the same thing, an "oscillating wave" over the signin box.
On this machine Browser Console mentions "TradeSUP is not defined" and "Error: Load timeout for modules https://secure2.bac-assets.com/spa/widgets/...". A "Need help with logging in?" link opens a blank popup which never finishes loading. [edit: after 10 minutes, it does load, with 6 not-useful topics.]

What did Merrill/BofA change?

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